Silicate, borate and phosphate-free cooling liquids based on glycols with improved corrosion behavior

摘要

The invention relates to a coolant concentrate consisting of: a) 0.1 bis 6 % by weight of at least one monocarboxylic and/or dicarboxylic acid with 4 to 16 C atoms in the form of alkali metal salts; b) 0.02 to 2 % by weight of a triazine-triiminocarboxylic acid in the form of the alkali metal salts thereof; c) 0.02 to 2 % by weight of at least one hydrocarbon triazole; d) 0.01 to 1 % by weight of at least one soluble alkaline earth sa e) optionally 4 % by weight water and f) glycols up to 100 % by weight in relation to the total weight of the concentrate.